US3685280A - Manual setting mechanism for digital alarm clock - Google Patents

Manual setting mechanism for digital alarm clock Download PDF

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Publication number
US3685280A
US3685280A US151187A US3685280DA US3685280A US 3685280 A US3685280 A US 3685280A US 151187 A US151187 A US 151187A US 3685280D A US3685280D A US 3685280DA US 3685280 A US3685280 A US 3685280A
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Prior art keywords
wheel
timepiece
wheels
minute
disks
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Expired - Lifetime
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US151187A
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English (en)
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Wolfgang Fehrenbacher
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Kieninger and Obergfell GmbH and Co
KUNDO KIENINGER and OBERGFELL
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Kieninger and Obergfell GmbH and Co
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B19/00—Indicating the time by visual means
    • G04B19/20—Indicating by numbered bands, drums, discs, or sheets
    • G04B19/21—Drums
    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C21/00—Producing acoustic time signals by electrical means
    • G04C21/16—Producing acoustic time signals by electrical means producing the signals at adjustable fixed times
    • G04C21/20—Producing acoustic time signals by electrical means producing the signals at adjustable fixed times by closing a contact to ring an electromechanical alarm

Definitions

  • An alarm clock with coaxial digit wheels for l-minute, 10-minute and hour indications has a pair of contactcarrying disks, rotatable about the same axis, mechanically coupled with the l-minute wheel and with the hour wheel, respectively, for entrainment thereby.
  • Each disk confronts an associated selector drum bearing minute and hour indications, respectively, these disks being independently settable to display the time when the alarm is to ring.
  • Each drum consists of insulating material and carries a terminal of an alarm circuit positioned to engage a contact near the periphery of the associated disk whenever the latter occupies a position corresponding to the selected drum setting; the disks are always conductively interconnected, by a contact spring on one disk engaging a metallic track on the other disk, so that the alarm circuit is completed when both disks occupy their preselected positions.
  • the disks are independently steppable by toothed actuators manually reciprocable in a slotted guide plate; a swingable detent interposed between the two lower order digit wheels prevents the resiliently indexable 10-minute wheel from overshooting its next position in response to a too rapid stepping of the 1-minute wheel through the associated disk.
  • a timepiece such as an alarm clock as disclosed in commonly owned application Ser. No. 101,974 filed by Gunter Hummel and Erich Scheer 28 December 1970.
  • Such a timepiece may be used, aside from alarm purposes, for timing a photographic exposure, for reading a laboratory instrument, or for carrying out any other operation beginning and ending at precisely predetermined instants.
  • my invention concerns a preferably electrically driven timepiece of the digital type, Le. a clock with a set of operatively interconnected digit wheels displaying time indications of a different denominational orders in a window of a housing, such as the units and tens digits of the minutes and corresponding numerical values for the hours.
  • the system disclosed in the aforementioned copending application includes two contact carriers and two rotary selectors coaxially juxtaposed therewith, each selector being independently settable to any one of a multiplicity of angular positions in which it is retained by friction or by suitable indexing means.
  • the two contact carriers which are preferably disk-shaped and will be referred to hereinafter as disks, are positively linked with the lowest ranking and a higher ranking digit wheel of the display unit, respectively, generally the 1- minute wheel and the hour wheel.
  • the rate of rotation of the disk entrained by the hour wheel is an aliquot fraction of the rate of rotation of the disk entrained by the 1-minute wheel, the latter will perform several (usually 12 or 24) full revolutions per operating cycle while the former makes only one turn in the course of such cycle.
  • the two disks Only once per cycle, therefore, will the two disks simultaneously occupy predetermined positions relative to the associated selectors in which coacting contacts on the two disks and the two selectors establish a connection to complete an external load circuit including, for example, an alarm device.
  • the time of occurrence of such a relative position depends, of course, on the presetting given to the two selectors which are advantageously calibrated in minutes and hours, respectively.
  • the alarm will go off at exactly the instant when the hour and minute settings of the selectors match the digital reading of the clockwork, the circuit being broken as soon as the parts move out of that relative position. If the clockwork is conventionally stepped so that its reading changes only once per minute, the coincidence position and therefore the operation of the alarm will last for exactly 1 minute.
  • Such a stepping drive causing successive jumps of each digit wheel or reel by one division, is well known in decimal counters or registers; it may include a single tooth on an input member periodically engaging the gear coupled with the digit wheel, a stepping pawl controlled by an electronically pulsed balancer, or a Geneva movement.
  • the two carrier disks advantageously are of identical basic construction including each a body of dielectric material with conductive facings on opposite surfaces and with throughgoing metallic connectors therebetween; one of the facings of each disk, on the side remote from the other disk, forms part of a contact spring projecting axially toward the associated selector which also has an insulating body formed with a peripherally located discontinuity in its insulation, the contact spring engaging this discontinuity once per revolution to extend the circuit.
  • the discontinuity may be simply a hole through which a contact spring can reach an underlying conductive surface, but in a preferred construction it is constituted by a metallic rivet with a first head contacting such a surface and a second head engageable by the contact spring of the disk.
  • the metallic facings on the two confronting disk sides are designed to provide a permanent conductive connection between the disks, one of these facings having the shape of an annular track while the other facing forms a contact spring engaging that track in any relative position of the two disks.
  • the general object of my present invention is to provide simple and conveniently operable means for manually advancing the several digit wheels for altering their time indications, more particularly for separately setting their minute and hour readings, independently of the associated electric motor or other prime mover serving for their automatic displacement.
  • a more specific object is to provide a compact assembly of manual controllers for the adjustment of both the digit wheels and the associated contact carriers to set the time and to select the desired alarm position, these controllers being readily accessible without requiring the opening of the clock housing or the removal of any parts.
  • I provide separate stepping means respectively engageable with the two contact carriers for selectively advancing same together with the associated digit wheels, advantageously against the force of indexing means yieldably retaining each digit wheel in any one of its several indicating positions, by preferably one indicating position at a time.
  • the hour wheel may be stepped in increments of either 15 or 30 whereas the 1-minute wheel, entraining the 10-minute wheel can be rotated through 36 with every stroke of the associated stepper.
  • steppers are designed as a pair of sliders reciprocably guided in a slotted plate and provided with working formations, such as sets of sawteeth, positioned to engage the toothed peripheries of a pair of rotary bodies respectively coupled with the two contact carriers for joint rotation. While these rotary bodies could be integral with the two carrier disks, it is generally more convenient to design them as pinions of substantially smaller diameter meshing directly or indirectly with the tooth peripheries of these disks.
  • the interdigital transmission stages are recessed in concave sides of the coaxial, equal-diarneter l-minute and hour wheels, with the smaller IO-minute wheel centered on an axis parallel to the common axis of the two larger wheels and with the distance between these axes approximately equaling the difference of the wheel radii whereby the digit-carrying peripheral portions of these wheels lie substantially in a common plane within the display zone exposed by a window in the clock housing.
  • each higher order wheel is entrained by the immediately preceding lower order wheel only once per revolution of the latter and over a fraction of a circle. Nevertheless, if the 1-minute wheel is manually stepped at high speed in the coupling position of the two minute wheels, the 10-minute wheel could be impelled with excessive force so as to skip its next indexed indicating position.
  • a pivoted stop member which is normally biased into a blocking position in the path of the several entrainable projections of the lO-minute wheel but is momentarily deflected into a nonblocking position, by the driving prohection of the 1-minute wheel, at the instant of operative coupling of the two minute wheels.
  • the driving projection of the 10-minute wheel (on the side thereof confronting the hour wheel) is advantageously designed as an overrunning-clutch type coupler by being mounted on a spring-loaded lever, giving clearance to the lateral projections of the hour wheel upon reversal of the normal relative rotation of the two wheels.
  • FIG. 1 is a front-elevational view (with parts broken away) of a digital clockwork provided with an alarm mechanism according to my invention
  • FIG. 2 is a bottom view of the assembly of FIG. 1;
  • FIG. 3 is an enlarged sectional elevation of the alarm control stage of the assembly of FIGS. 1 and 2;
  • FIG. 4 is a side view of the assembly of FIG. 3;
  • FIG. 5 is a bottom view of that assembly
  • FIG. 7 is a side view of an intermediate digit wheel, as seen in the direction VII of FIG. 6;
  • FIG. 8 is an enlarged bottom view of a component also seen in FIG. 5;
  • FIG. 9 is a side view of a slider forming part of the component of FIG. 8;
  • FIG. 10 shows the component of FIG. 8 from the opposite side
  • FIG. 11 is a view similar to FIG. 9 but showing the component in section and on a larger scale.
  • FIGS. 1 and 2 I have shown parts of the housing of an electrical digital clock including a bracket 1 with two upstanding anns 2, 3.
  • This housing has a window, not shown, for displaying the time of day (here 16:36 hours or 4:36 PM) in the form of digits carried by three coaxial wheels 4, 5 and 6.
  • Digit wheel 4, bearing the numerals 0 to 9, and digit wheel 5, bearing the numerals 0 to 5, show the minutes;
  • digit wheel 6 displays the hours with the aid of eight peripherally mounted prismatic bodies of which three, designated 8, 9 and 10, are visible in FIG. 1.
  • Bracket 1 supports, via posts 13 and screws 14, a similar, smaller bracket 15 having upstanding arms 16 and 17.
  • the arm 3 of bracket 1 is broadened to serve as a mounting plate for a motor 22 and other parts of the stepping drive, the motor having a base 31 supported on plate 3 by posts 21.
  • Two further mounting plates 33, 34 are secured to plate 3 by means of mounting bolts 32 surrounded by tubular spacers 35.
  • the sleeves 41 and 42 further receive hubs 45, 46 of a pair of insulating selector elements 37 and 36, respectively, which are generally cup-shaped with outwardly facing concavities embracing the indexing plates 49 and 50.
  • the elements 37 and 36 which will be referred to hereinafter as drums, have end walls 53, 54 each formed near its periphery with an annular array of corrugations 56, 56' engaged by the rounded extremity 57 or 57' of the associated binding post 55 or 55', the latter being secured to the corresponding indexing plate 49, 50 whose resiliency tends to maintain the extremities 57 or 57 in engagement with the corrugated surface 56 or 56'.
  • the corrugations of this surface are as numerous as the angular settings of the corresponding selector drum,
  • Posts 55 and 55' are in conductive contact with the metalized zones 51 and 51 of plates 49 and 50, respectively, which are engaged by proximal heads of rivets 52, 52 traversing the drum walls 53 and 54, respectively.
  • drum 37 carries hour markings (here ranging from O0 to 23, in conformity with those of digit wheel 6) while drum 36 is similarly provided with minute markings (ranging from O0 to 59). It will be convenient, as shown, to write out only the even-numbered indications and to replace the odd-numbered ones by lines, dots or the like.
  • These 24 scale divisions of drum 37 and 60 scale divisions of drum 36 can be observed through a viewing slot of the housing and/or read against an arrow or other marker alongside each drum showing the exact hour and minute to which the two drums have been set.
  • Two disks 38, 39 are sandwiched between the drums 36, 37 and are also freely rotatable on the axle 40.
  • the two disks have identically shaped bodies of insulating material, preferably a thermoplastic resin, and are respectively coupled with l-minute wheel 4 and with hour wheel 6 for entrainment thereby.
  • disk 38 performs exactly one revolution per hour whereas disk 39 makes one revolution every 24 hours.
  • the latter disk juxtaposed with drum 37, carries a contact spring 79 bearing upon the outer surface of drum wall 53 along an orbit which includes the rivet 52 so that the electric circuit from terminal 55 is extended to disk 39 whenever this disk and the drum 37 are in a predetermined relative position, i.e.
  • disk 38 carries a contact spring 81 on its side facing the drum 36, the latter spring bearing upon the outer surface of drum wall 54 to make contact with the rivet 52' thereof in a relative position in which the minute reading of the drum corresponds to that displayed by the digit wheels 4 and 5.
  • Rivet 52 and spring 79 are so dimensioned and positioned that their area of contact extends over less than and is limited to a single operating position of disk 39 for any indexed position of drum 37; in an analogous manner, the area of contact of rivet 52 and spring 81 extends over less than 6 and is also limited to a single operating position of disk 38 for any indexed position of drum 36.
  • Disk 39 is further provided with a conductive annular track 83 continually wiped by a contact brush 80 on the inner surface of disk 38; with springs 80 and 81 conductively interconnected and with spring 79 also permanently connected to track 83, spring 79 lies always in circuit with spring 81 so that the load circuit 201 203 is completed whenever spring 79 contacts the rivet 52 at the same time that the spring 81 engages the rivet 52'.
  • the rivets 52 and 52 represent discontinuities in the insulation of their respective drums and, in a simplified system, may be replaced by openings in the drum wall through which the free ends of the contact springs 79 and 81 can reach the conductive zones 51 and 51', respectively, whenever the disk position matches the settings of the associated drums.
  • Such a simplification, reducing the contact resistance, is particularly advantageous with low-voltage power supplies, yet the interposition of the rivets affords greater precision.
  • the transmission linking digit wheels 4 and 6 with disks 38 and 39, respectively, includes a shaft 66 extending parallel to the wheel axis, this shaft being journaled in an upturned extension 68 of bracket 1 and in the mounting plate 33.
  • a gear on shaft 66 is in mesh with the toothed periphery of wheel 6 while a pinion 69 on the other end of that shaft drives a gear 77 keyed, together with a pinion 78, on a sleeve 76 freely rotatable on another shaft 73 spanning the plates 33 and 34.
  • a similar sleeve 70 freely rotatable on shaft 66, bears a gear 71 in mesh with the toothed periphery 64 of wheel 4 and terminate in a pinion 72 meshingwith a gear 74 keyed to shaft 73.
  • Disk 39 has a toothed periphery 62 in mesh with pinion 78 whereas disk 38 also has a toothed periphery 63 in mesh with a similar pinion keyed to shaft 73.
  • This gear train provides a step-down ratio of 24 m (i.e.
  • the load circuit of FIG. 3 is closed once per 24-hour period for exactly 1 minute; naturally, this load circuit may include a holding relay or other timing means for either foreshortening or exte nding the operating time of the alarm 202.
  • Digit wheels 4, 5 and 6 are rotatably joumaled on three fixed shafts 19, 18 and 7, respectively, all parallel to the transmission shaft 66.
  • Shaft 7 extends between uprights 2 and 16; shafi 18 spans the arms 16 and 17 of bracket 15 which lie within the concave sides of the two hollow wheels 6 and 4, confronting the intermediate wheel 5, while shaft 19 is secured to uprights 17 and 3 in line with shaft 7.
  • the two aligned shafts 7 and 19 are offset from shaft 19 by a distance equal to the difference between the radii of the two larger wheels 4, 6 (which are of like diameter) and of the smaller wheel 5 whereby the centrally disposed faces of the polygonal peripheries of the wheels 4, 5 and 6 as viewed in H6.
  • Wheel 5 is also laterally recessed, as seen in FIGS. 6 and 7, so as to have two overhanging rims 111, 136 corresponding to a rim on the concave side of wheel 6 and a similar rim on the confronting face of wheel 4.
  • the spaces framed by rim 100 of wheel 6 and by the corresponding rim of wheel 4 serve to accommodate indexing means constituted, in the case of wheel 6, by a ratchet 101 normally engaged by a pawl 103 which is swingable about a fulcrum 104 and has its free end 105 stressed by a tension spring 107 anchored at 106 to the body 102 of the digit wheel.
  • the analogous indexing mechanism for wheel 4 has not been illustrated, yet its counterpart on wheel 5 has been shown in FIG.
  • lever 7 to comprise a ratchet 117 rigid with shaft 18 and a pawl 121 pivoted to the wheel at 119, its free end 120 being stressed by a spring 116 anchored at 115 to an escapement lever 1 13 with a fulcrum 1 12.
  • the free end 1 14 of lever 113 is integral with an axially extending projection or dog 110, having a transverse face 119 and a beveled face 120, which is normally held by spring 116 against the inner peripheral surface of rim 111 so as to lie in the path of a set of co-operating projections 109 of wheel 6 formed as internal ribs on the rim 100 thereof.
  • Similar projections 130 in the shape of prismatic studs, extend axially from the inner periphery of rim 136 of wheel 5 into the concave side of wheel 4 for coupling engagement with a single dog 131 fixed within that side to the rim of the latter wheel.
  • ratchets 117 and 101 In conformity with the number of active faces of wheels 5 and 6, ratchets 117 and 101 have six and eight teeth, respectively; similarly, there are eight projections 109 on the former wheel and six projections 130 on the latter wheel.
  • wheel 5 is stepped once per revolution of wheel 4 through an angle of 60 whereas the wheel 6 is advanced once per revolution of wheel 5 through an angle of 45.
  • the primary stepping drive for wheel 4 includes, besides the synchronous motor 22, a gear train 23-30, 30;, 30b; if this drive comprises a stage with position immobilization of the load, such as a Geneva motion, the aforementioned indexing mechanism for digit wheel 4 may be omitted.
  • lever 113 has the effect of an overrunning clutch by permitting the hour wheel 6 to overtake the IO-minute wheel 5 on being manually rotated (counterclockwise as viewed in FIG. 7) to change the hour indication, with the projections 109 camming aside the projection 110 by bearing upon the beveled face 120 thereof if the latter projection happens to lie between the two foremost ribs 109', 109" of wheel 6 as illustrated in FIG. 6, i.e. if wheel 5 occupies the 50- minute position in which its next step would advance the wheel 6 from, say, the l l-oclock to the l2-oclock position.
  • a manual advance of 1- minute wheel 4 may also step the lO-minute wheel 5 and possibly the hour wheel 6, in the same way as does the automatic drive.
  • the range of positive entrainment of wheel 5 by wheel 4 and of wheel 6 by wheel 5 may be somewhat less than 60 and 45, respectively, inasmuch as the force of loading springs 116 or 107 will in such case complete the rotation of the follower wheel through the desired angle. If, however, the user applies excessive force to the l-minute wheel 4 in turning it past the carry position (illustrated in FIG. 6) in which dog 131 engages the next projection of wheel 5, the latter could be propelled past its next indexing position so as to overshoot its desired setting.
  • a stop member 132 in the form of a yoke with two arms 133, 134 straddling the shaft 18 of wheel 5, this yoke having a hole 132 traversed by a pivot pin (not shown) in the recessed side of wheel 4 so as to be limitedly swingable between an operative position and an inoperative position.
  • an axial extension 141 of arm 133 lies in the path of a stud 130' so as to block the advance of the wheel 5; a transverse extension 140 of arm 134 lies in a zone beyond the ends of studs 130.
  • extension 140 engages the extension 140 so as to deflect the yoke 132 in a clockwise sense into a non-blocking position to clear the stud 130', yoke 132 returning immediately to its normal position with the continuing advance of dog 131 so that extension 141 intercepts the next-following stud of wheel 5 at a point where pawl 121 is effective to index that wheel for a proper centering of its exposed digit in the viewing window.
  • This positive limitation of the advance of intermediate wheel 5 to a single step also prevents any possible overstepping of hour wheel 6.
  • An abutment 142 integral with bracket arm 17 arrests the stamped or molded yoke member 132 in its normal position by engaging its arm 133.
  • FIGS. 4, 5 and 8 11 show details of the manual stepping means for wheels 4 and 6.
  • a guide plate with a pair of parallel slots 156, 156', transverse to the wheel axes, is secured to mounting plates 33, 34 with the aid of indentations 151, 151' and slots 152, 152' of plate 150 receiving projections 188, 188' and tabs 187, 187' of these mounting plates, two hook-shaped lugs 186, 186' on the latter plates engaging edges 184, 184' of recesses 185, 185' formed at the lower comers of plate 150 as viewed in FIGS. 8 and 10 (see also FIG. 2).
  • sliders 155 are respectively guided in slots 156, 156' for manual reciprocation, each of these sliders consisting (as particularly illustrated for slider 155) of an outer part 153 and an inner part 154 snapfitted together.
  • part 153 has a T-profile with a stem 162 and a bar 159 having a milled surface 160, T-bar 159 being constituted by a raised portion of a strip 158 which rests flat against the outer surface of guide plate 150 and spans the slot 156 thereof; corresponding elements of slider 155' have been designated 158', 159'.
  • Stem 162 is formed with a pair of bosses 165 received, with play, in recesses of two jaws 164 of part 154 bracketing that stem, part 154 being of sufficiently resilient material (metal or plastic) to facilitate the snap interfitting of the two parts within a cutout of strip 158.
  • Jaws 164 passing together with stem 162 through guide slot 156, form a web integral with a flange of part 154 projecting laterally beyond that slot, this flange being formed with sawteeth 163 positioned to engage a set of peripheral teeth of sleeve 76 integral with pinion 78 (cf. FIG. 2); the corresponding sawteeth of slider 155' are engageable with similar teeth 174 on an extension of pinion 75.
  • a curved leaf spring 173, also bridging the slot 156, has a central slot traversed by the web 164 so as to bear upon the flange portion of part 154 in an inward direction (arrow A, FIG. 11), i.e. in a sense tending to reduce the clearance 161 between web 164 and T-bar 159 so as to hold the sawteeth 163 in line with the coacting teeth 175, these latter teeth being advantageously undercut as shown in order to maintain their engagement with teeth 163 when the slider 155 is moved upwardly in the direction of arrow B.
  • the sloping edges of teeth 163 and 175 drive the part 154 outwardly against the force of spring 173 into the position shown in FIG.
  • Sliders 155 and 155' are biased into their normal retracted positions (i.e. downwardly in FIGS. 8 11) by a transverse arm 167 whose extremities 168, 168' engage in a clearance 169 formed between the two parts of the respective slider.
  • 'I'he midpoint 171 of arm 167 is under tension from a coil spring 166 lodged in a cutout 170 of guide plate 150 and anchored to the lower edge 172 of that cutout; either slider may therefore be moved upwardly, with the limits of the corresponding guide slot 156 or 156', against the restoring force of that spring.
  • the length of these slots is advantageously so chosen that a stroke of the slider 155 rotates disk 39 and hour wheel 6 through a little more than whereas the slider 155' rotates disk 38 and 1- minute wheel 4 through a little more than 6 (as indicated by the somewhat greater length of slot 156 in comparison with slot 156'), enabling each digit wheel to be returned to its proper indexed position by the associated spring'loaded pawl.
  • the number of manual reciprocations of sliders 155 and 155' determines the number of hours and minutes, respectively, by which the time setting of the clock is to be advanced.
  • a pair of milled wheels 176, 177 are freely rotatable on a shaft 178 spanning the mounting plates 33 and 34. Wheels 176 and 177 are inegral with a pair of pinions 1'79, 180, respectively, meshing with respective pinions 182, 183 on another shaft 181 supported by these plates. Pinions 182 and 183 engage the peripheral teeth 61 and 60, respectively, of drums 36 and 37 which are thus independently rotatable with the aid of these milled wheels.
  • the system herein disclosed allows for manual resetting at any time, even during the stepping of a higher order digit wheel by one of a lower order.
  • a timepiece comprising:
  • a set of operatively interconnected digit wheels including a first wheel provided with time indications of a relatively high denominational order and a second wheel provided with time indications of a relatively low denominational order;
  • transmission means positively linking said first and second contact carriers with said first and second wheels, respectively, for rotary entrainment thereby;
  • first and second stepping means normally disengaged from but respectively engageable with said first and second contact carriers for selectively advancing same together with the associated digit wheels independently of said drive means;
  • first rotary selector and a second rotary selector centered on said axis and confronting said first and second contact carriers, respectively, said selectors being independently settable to any one of a multiplicity of angular positions;
  • conductor means maintaining a continuous conductive connection between the contacts on said contact carriers
  • a load circuit including a source of current and a controlled device connected across the contacts of said selectors for actuation of said device upon simultaneous making of said first and second contacts.
  • said drive means comprises mechanism for intermittently advancing said first and second wheels through successive indicating positions corresponding to the multiplicity of angular positions of said first and second selector means, respectively, whereby said load circuit remains closed for a period equaling the residence time of said second wheel in any of its indicating positions, each of said digit wheels being provided with indexing means for yieldably retaining same in each indicating position thereof, said stepping means being operable to advance the associated digit wheels by one indicating position.
  • each of said sliders comprises two interfitted parts, one of said parts resting against a surface of said guide plate, the other of said parts having a set of sawteeth constituting said working formation and being movable with reference to said one of said parts, in a direction transverse to said surface, against a biasing force for clearing the toothed periphery of the associated rotary body upon a return of the slider to said normal position.

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3762151A (en) * 1971-11-18 1973-10-02 Seiko Koki Kk Time-detecting system for a digital interval timer
US3807165A (en) * 1971-07-14 1974-04-30 T Kawada Clock having a timer
JPS5050371U (it) * 1973-09-05 1975-05-16
US4005570A (en) * 1974-07-09 1977-02-01 Rhythm Watch Company, Limited Leaf-type digital clock
US4045627A (en) * 1974-04-04 1977-08-30 Seiko Koki Kabushiki Kaisha Switching mechanism for alarming time detection in an alarming device
US4232511A (en) * 1977-08-29 1980-11-11 Seiko Koki Kabushiki Kaisha Time detecting device for a clock
US4287586A (en) * 1978-12-28 1981-09-01 Seiko Koki Kabushki Kaisha Signaling time detecting device for leaf type digital clock
US4293938A (en) * 1978-12-28 1981-10-06 Seiko Koki Kabushiki Kaisha Alarm signaling time detecting device for digital clock
US10458601B1 (en) * 2017-10-25 2019-10-29 Robert Gorham Safety system for gas cylinder valves and method of use

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2001195A (en) * 1933-02-17 1935-05-14 Design Engineers Inc Clock
US2587277A (en) * 1949-01-05 1952-02-26 Bergman Jack Setting mechanism for direct reading numeral clocks
US2636339A (en) * 1949-03-02 1953-04-28 Holzner Adolf Cyclometer indicator mechanism for twenty-four hour cyclometer clocks
US3597918A (en) * 1969-10-06 1971-08-10 Gen Time Corp Digitally indicating clock-timer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2001195A (en) * 1933-02-17 1935-05-14 Design Engineers Inc Clock
US2587277A (en) * 1949-01-05 1952-02-26 Bergman Jack Setting mechanism for direct reading numeral clocks
US2636339A (en) * 1949-03-02 1953-04-28 Holzner Adolf Cyclometer indicator mechanism for twenty-four hour cyclometer clocks
US3597918A (en) * 1969-10-06 1971-08-10 Gen Time Corp Digitally indicating clock-timer

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3807165A (en) * 1971-07-14 1974-04-30 T Kawada Clock having a timer
US3762151A (en) * 1971-11-18 1973-10-02 Seiko Koki Kk Time-detecting system for a digital interval timer
JPS5050371U (it) * 1973-09-05 1975-05-16
JPS5332053Y2 (it) * 1973-09-05 1978-08-09
US4045627A (en) * 1974-04-04 1977-08-30 Seiko Koki Kabushiki Kaisha Switching mechanism for alarming time detection in an alarming device
US4005570A (en) * 1974-07-09 1977-02-01 Rhythm Watch Company, Limited Leaf-type digital clock
US4232511A (en) * 1977-08-29 1980-11-11 Seiko Koki Kabushiki Kaisha Time detecting device for a clock
US4287586A (en) * 1978-12-28 1981-09-01 Seiko Koki Kabushki Kaisha Signaling time detecting device for leaf type digital clock
US4293938A (en) * 1978-12-28 1981-10-06 Seiko Koki Kabushiki Kaisha Alarm signaling time detecting device for digital clock
US10458601B1 (en) * 2017-10-25 2019-10-29 Robert Gorham Safety system for gas cylinder valves and method of use

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IT987539B (it) 1975-03-20
FR2096778B4 (it) 1974-10-18
DE2028679A1 (de) 1971-12-16
FR2096778A7 (it) 1972-02-25

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